21036546 has 24 divisors (see below), whose sum is σ = 46640880. Its totient is φ = 6848856.

The previous prime is 21036539. The next prime is 21036563. The reversal of 21036546 is 64563012.

21036546 is a `hidden beast` number, since 2 + 1 + 0 + 3 + 654 + 6 = 666.

It is a super-2 number, since 2×21036546² = 885072535220232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12816 + ... + 14363.

It is an arithmetic number, because the mean of its divisors is an integer number (1943370).

Almost surely, 2^21036546 is an apocalyptic number.

21036546 is an abundant number, since it is smaller than the sum of its proper divisors (25604334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21036546 is a wasteful number, since it uses less digits than its factorization.

21036546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27230 (or 27227 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 21036546 is about 4586.5614571267. The cubic root of 21036546 is about 276.0523687648.

Adding to 21036546 its reverse (64563012), we get a palindrome (85599558).

It can be divided in two parts, 2103 and 6546, that added together give a square (8649 = 93²).

The spelling of 21036546 in words is "twenty-one million, thirty-six thousand, five hundred forty-six".